去年冬天以来,广东出现历史上少见的大旱,一些地区采用人工降雨的方法缓解旱情.一种

题型:问答题

问题:

去年冬天以来,广东出现历史上少见的大旱,一些地区采用人工降雨的方法缓解旱情.一种人工降雨的方法是把干冰撒播到云中使其降雨.请你利用学过的物理知识解释上述人工降雨过程.小资料:干冰是固态的二氧化碳,干冰容易升华.

考点:升华现象液化现象、方法及其应用
题型:问答题

属于水溶性维生素的有()

A.维生素C

B.维生素E

C.维生素K

D.泛醌

E.维生素B族

题型:问答题
—Go for a trip after the exam,OK?
—________.I love getting close to nature to relax.
A.I couldn’t agree moreB.I’m afraid not
C.I believe notD.I don’t think so
题型:问答题

其分子结构中具氧环的是

A.小檗碱
B.麻黄碱
C.伪麻黄碱
D.东莨菪碱
E.山莨菪碱

题型:问答题

Questions 21-25 are based on the following passage:

I hear many parents complaining that their teenage children are rebelling. I wish it were so. At your age you ought to be growing away from your parents. You should be learning to stand on your own two feet. But take a good look at the present rebellion. It seems that teenagers are all taking the same way of showing that they disagree with their parents. Instead of striking out boldly on their own, most of them are clutching at one another’s hands for courage.
They claim they want to dress as they please. But they all wear the same clothes. They set off in new directions in music. But somehow they all end up just by listening to the same record. Their reason for thinking or acting in this way is that the crowd is doing it.
It has become harder and harder for a teenager to stand up against the popularity wave and to go his or her own way. Industry has firmly carved out a teenage market. These days every teenager can learn from the advertisements what a teenager should have and be. And many of today’s parents have come to award high marks for the popularity of their children. All this adds up to a greater barrier for the teenager who wants to find his or her own path.
But the barrier is worth climbing over. The path is worth following. Find yourself. Be yourself. Popularity will come--with the people who respect you for whom you are. That’s the only kind of popularity that really counts.

The author thinks of advertisements as ______.

A.original

B.influential

C.detrimental

D.authoritative

题型:问答题

读右图,回答下列题:

此图乙、丙处若为北太平洋海水等温线图,等值线的数值向北递减,则丙处为()

A.北赤道暖流

B.北太平洋暖流

C.日本暖流

D.加利福尼亚寒流

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