Honey(蜂蜜)from the African forest is not

题型:阅读理解

问题:

Honey(蜂蜜)from the African forest is not only a kind of natural sugar, it is also delicious. Most people, and many animals, like eating it. However, the only way for them to get that honey is to find a wild bees' nest(巢)and take the honey from it. Often, these nests are high up in trees, and it is difficult to find them. In parts of Africa, though, people and animals looking for honey have a strange and unexpected helper一a little bird called a honey guide.

The honey guide does not actually like honey, but it does like the wax (蜂蜡) in the beehives (蜂房). The little bird cannot reach this wax, which is deep inside the bees’ nest. So, when it finds a suitable nest, it looks for someone to help it. The honey guide gives a loud cry that attracts the attention of both passing animals and people. Once it has their attention, it flies through the forest, waiting from time to time for the curious animal or people as it leads them to the nest. When they

finally arrive at the nest, the follower reaches in to get at the delicious honey as the bird patiently waits and watches. Some of the honey, and the wax, always falls to the ground, and this is when the honey guide takes its share.

Scientists do not know why the honey guide likes eating the wax, but it is very determined in its efforts to get it. The birds seem to be able to smell wax from a long distance away. They will quickly arrive whenever a beekeeper is taking honey from his beehives, and will even enter churches when beeswax candles are being lit.

小题1:Why is it difficult to find a wild bees' nest?

A.It's small in size.

B.It's hidden in trees.

C.It's covered with wax.

D.It's hard to recognize.小题2:What do the words "the follower" in Paragraph 2 refer to?

A.A bee.

B.A bird.

C.A honey seeker.

D.A beekeeper.小题3:The honey guide is special in the way________.

A.it gets its food

B.it goes to church

C.it sings in the forest

D.it reaches into bees' nests小题4:What can be the best title for the text?

A.Wild Bees

B.Beekeeping in Africa

C.Wax and Honey

D.Honey-Lover's Helper

考点:科教类阅读
题型:阅读理解

家鸡的无尾(M)对有尾(m)是显性。现用有尾鸡(甲群体)交配产生的受精卵孵小鸡,在孵化早期向卵内注射微量胰岛素,孵化出的小鸡(乙群体)表现无尾性状。为研究胰岛素在小鸡孵化过程中是否引起基因突变,可行性方案是[ ]

A.甲群体×甲群体,孵化早期不向卵内注射胰岛素

B.甲群体×乙群体,孵化早期向卵内注射胰岛素

C.乙群体×乙群体,孵化早期不向卵内注射胰岛素

D.乙群体×乙群体,孵化早期向卵内注射胰岛素

题型:阅读理解

在酸水汽提中进料酸水一般不可能有()。

A、CH4

B、CO2

C、SO2

D、H2S

题型:阅读理解

机体免疫防御功能亢进会导致

A.严重感染
B.免疫缺陷病
C.移植排斥反应
D.超敏反应
E.恶性肿瘤

题型:阅读理解

向心性肥胖的原因是()

A.糖皮质激素分泌过多

B.食物中缺碘

C.幼年时甲状腺功能不足

D.食物中缺少蛋白质

E.胰岛素分泌不足

题型:阅读理解

简述钩藤降压作用有效成分、特点及作用机理。

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