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请找出下列第2和第3段的主题句 1 There are two things I have always wanted to do -- write and live on a farm. Today I'm doing both. I am not in E. B. White's class as a writer or in my neighbors' league as a farmer, but I'm getting by. And after years of frustration with city and suburban living, my wife Sandy and I have finally found contentment here in the country. 2. It's a self-reliant sort of life. We grow nearly all of our fruits and vegetables. Our hens keep us in eggs, with several dozen left over to sell each week. Our bees provide us with honey, and we cut enough wood to just about make it through the heating season. 3. It's a satisfying life too. In the summer we canoe on the river, go picnicking in the woods and take long bicycle rides. In the winter we ski and skate. We get excited about sunsets. We love the smell of the earth warming and the sound of cattle lowing. We watch for hawks in the sky and deer in the cornfields.
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【单选题】等量 R -乳酸和 S -乳酸的混合物称为 :
A.
内消旋体
B.
外消旋体
C.
对映体
D.
非对映体
【单选题】He got very angry but many of us thought there was no reason . [     ]
A.
to be
B.
to being
C.
being
【单选题】There was no reason for such people to feel threatened by the initial incursions of modernity...
A.
Nothing could make such people fearful of the early changes brought about by modernization...
B.
Such people have no reason not to worry about the threat to their traditional life by modernity...
【单选题】(R,R)- 酒石酸与( S , S ) - 酒石酸的关系是()
A.
对映异构体
B.
非对映异构体
C.
同一种物质
D.
没有任何关系
【单选题】There was no reason ______ the meeting yesterday.
A.
for your not attending
B.
for your not to attend
C.
for your not attend
D.
for you to not attend
【单选题】There was no reason for such people to feel threatened by the initial incursions of modernity ... (Para. 12)
A.
Nothing could make such people fearful of the early changes brought about by modernization …
B.
Such people have no reason not to worry about the threat to their traditional life by modernity ...
【单选题】(R,R)-酒石酸与(R,S)-酒石酸的关系是?
A.
对映异构体
B.
非对映异构体
C.
是同一种物质
D.
没有任何关系
【单选题】盐酸麻黄碱的立体结构为A.(1R,2S)()B.(1S,2S)一()C.(1R,2R)()D.(1S,2R)()E.(1R,2R)()
A.
盐酸麻黄碱的立体结构为 A.(1R,2S)-(-)
B.
(1S,2S)一(+)
C.
(1R,2R)-(-)
D.
(1S,2R)-(+)
E.
(1R,2R)-(+)
【单选题】马来酸氯苯那敏的光学异构体之间活性关系是
A.
R=S
B.
R>S
C.
S>R
D.
R≥S
E.
S≈R
【单选题】(R,R)-酒石酸与( S,S)-酒石酸的关系是什么?
A.
对映异构体
B.
非对映异构体
C.
同一种物质
D.
没有任何关系
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