8. What does the woman want to do?
A. She wants a short tour in London. B. She wants to go the Hyde Park Hotel.
C. She wants to ask the way to the British Museum.
7. How much do you suppose the man will spend on a raincoat?
A. 2 dollars. B. 10 dollars. C. 12 dollars.
听第7段材料,回答第8~10题。
6.When can the man get a cheaper raincoat?
A. Now. B. On Sunday. C. Next Monday.
4. How many channels can the lady’s radio pick up now?
A. Two. B. Eight. C. Six.
3. What are the two speakers doing?
A. Walking down a hill. B. Climbing stairs. C. Discussing a trip.
2. When can we possibly borrow the book in the library?
A. In July. B. In August. C. In September.
1. Where do you think the conversation most probably take place?
A. At a hotel. B. At a department store. C. At a railway station.
49.右图表示不同浓度生长素对植物根、芽、茎的生长影响,根据下图回答问题:
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(1)从图中可以看出生长素的生理作用具有 性。
(2)分析10-8M对根、芽、茎的作用,得出的结论是 。
(3)从三条曲线可以看出,对生长素最敏感的是 。
(4)若想培养出无根豆芽,配制的生长素溶液的最适浓度是 mol·L-1。
(5)植物体内的具有生长素效应的物质是 。
48.
右图是某种淋巴细胞,膜外颗粒状物质为抗体。请据图回答:
(1)该细胞是浆细胞,它是由 细胞分化而来。
(2)抗体的化学本质是 ,它能与 发生特异性结合,发挥免疫效应。
(3)当细菌在体液中活动时,会被相应的 消灭,当其进入人体细胞内部时,则被相应的 消灭,该过程统称为特异性免疫。
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