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【单选题】
下列关于生物固氮和固氮微生物不正确的是（） ①根瘤菌的固氮量与其侵入植物的生长状况无关 ②圆褐固氮菌固定的氮可直接被植物吸收利用 ③生物固氮过程就是通过固氮微生物，把大气中的氮气转化为氨 ④根瘤菌是共生固氮菌，独立存在时不能生存 ⑤根瘤菌的固氮基因编码区内的外显子的数量比内含子多 ⑥大豆种子用其破碎的根瘤进行拌种，可以提高豆科植物的产量A.
③⑥
B.
④
C.
③④
D.
①②④⑤
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【单选题】--It's so hot today. --It's true. It's _______ yesterday.
A.
two degrees hotter than
B.
two degrees as hot as
C.
two degree hotter than
D.
as two degrees hot as
【单选题】— What a day! It is quite hot today. — _____. Let's go swimming. [ ]
A.
So it is
B.
So is it
C.
So it does
D.
So does it
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【单选题】Seeing emerging adulthood as a normal stage of life can help ____ our anxiety.
A.
ease
B.
relax
C.
relieve
D.
weaken
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【判断题】Most Chinese firms do not report any exporting activity at all — sell only to Chinese customers.
A.
正确
B.
错误
【单选题】Seeing emerging adulthood as a normal stage of life can help ____our anxiety.
A.
ease
B.
relax
C.
relieve
D.
weaken
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