有些假分数的分子不是分母的倍数,这样的假分数可以写成()和()合成的数,通常叫(

题型:填空题

问题:

有些假分数的分子不是分母的倍数,这样的假分数可以写成(    )和(    )合成的数,通常叫(    )。

考点:真分数,假分数,带分数
题型:填空题

两侧球状突未联合()

A.横面裂

B.斜面裂

C.单侧唇裂

D.上唇正中裂

E.下唇唇裂

题型:填空题

细胞膜的主动运输以下叙述错误的是()。

A.不消耗能量

B.需要ATP

C.消耗能量

D.物质可克服浓度差转运

题型:填空题

在过去两个世纪内,人类排放的二氧化碳40%被海洋所吸收,大海减缓了全球变暖的步伐,但是将付出高昂的代价:与工业化前水平相比,二氧化碳导致海洋的平均PH值降低了大约0.1个单位。视现在二氧化碳的排放速度,到21世纪中叶,海洋的平均PH值下降可以高达0.35个单位。海洋酸化给海洋生物带来了严重损害,实验表明,PH值降低0.2—0.3个单位,将干扰海洋生物中最重要的基础生物珊瑚虫以及其它浮游生物的骨骼钙化。为了保护海洋生物,需将PH值下降范围控制在0.2以内,这是1976年美国国家环境保护局发布的极限值。
这段文字意在说明( )。

A.二氧化碳大量排放引发海洋酸化,海洋生物面临生存危机

B.海洋酸化危害海洋生物生存,二氧化碳减排迫在眉睫

C.海洋酸化将引发新一轮的环境危机,须警惕其对海洋生物的危害

D.对海洋酸化的趋势应引起重视,务必将PH值控制在极限值以内

题型:填空题

阅读理解。

     Dolphins and sharks are showing up in surprisingly shallow water just off the Florida coast. Mullets, crabs,

rays and small fish gather by the thousands off an Alabama pier. Birds covered in oil are crawling deep into

marshes (沼泽), never to be seen again.

     Marine scientists studying the effects of the BP disaster (英国石油公司漏油事件) are seeing some strange

phenomena. Fish and other wildlife seem to be fleeing the oil out in the Gulf and clustering in cleaner waters

along the coast in a trend that some researchers see as a potentially troubling sign. The animals' presence close

to shore means their usual habitat is badly polluted, and the crowding could result in mass die-offs as fish run

out of oxygen. Also, the animals could easily be captured by their enemies.

     The nearly two-month-old spill (漏油) has created an environmental disaster in US history as tens of millions

of gallons have flown into the Gulf of Mexico ecosystem. Scientists are seeing some unusual things as they try

to understand the effects on thousands of species of marine life.

     For nearly four hours Monday, a three-person crew with Greenpeace cruised past delicate islands and

mangrove-dotted inlets in Barataria Bay off southern Louisiana. They saw dolphins by the dozen frolicking (嬉

戏) in the oily sheen (光泽) and oil-tinged pelicans feeding their young. But they spotted no dead animals.

     "I think part of the reason why we're not seeing more yet is that the impacts of this crisis are really just

beginning," Greenpeace marine biologist John Hocevar said.

     The counting of dead wildlife in the Gulf is more than an academic exercise; the deaths will help determine

how much BP pays in damages.

1. What does the marine life react to the BP disaster?

A. Birds crawl deep into caves.

B. Dolphins and sharks show up in deep water.

C. Tens of thousands of marine animals are found dead.

D. Sea creatures flee from the spilled oil, gathering near the seashore.

2. Which of the following is NOT related to the potentially troubling sign?

A. The usual habitat of deep-water animals is badly polluted.

B. Many animals could be easily eaten by their enemies.

C. Masses of fishes could die due to lack of oxygen.

D. Some dolphins are frolicking in marshes.

3. The environmental disaster was caused by ____.

A. the damage of the Mexico Gulf ecosystem

B. the lack of environmental sense of BP

C. the nearly two-month-old oil spill

D. the crowding marine life

4. What is John Hocevar's attitude towards the disaster?

A. Worried.

B. Disappointed.

C. Depressed.

D. Optimistic.

5. From the passage, we can infer that ____.

A. BP will pay much money according to the number of the dead wildlife there

B. marine scientists have seen some strange phenomena

C. the disaster has little influence on dolphins

D. a three-person crew reached no conclusion

题型:填空题

おなかがすいていたので、料理を2人分食べて()。

A.いた

B.しまった

C.おいた

D.あった

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