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进化 divergent evolution
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【简答题】Plastic and traces of hazardous chemicals have been found in Antarctica, one of the world’s last great wildernesses, according to a new study. Researchers spent three months taking water and snow samp...
【多选题】对沉井下沉的施工要点的叙述中，正确的是( )。
A.
沉井下沉时，可使用爆破方法
B.
沉井下沉施工有排水除土和不排水除土两种方法
C.
沉井预制完成并准确就位后，开始抽除垫木
D.
井底下沉至设计标高2.0m以上时，应放慢下沉速度
E.
正常下沉时，应自刃脚处向中间均匀对称除土
【单选题】To label their produce as organic, farmers have to obtain a certificate showing that no ________ chemicals have been used to kill pests on the farm for two years.
A.
toxic
B.
tragic
C.
nominal
D.
notorious
【多选题】Chemicals have been added to food for unacceptable reasons:
A.
To disguise inferior products
B.
To deceive the consumer
C.
To provide otherwise desirable results that lower the nutritional value
D.
To replace good manufacturing practices
【单选题】These chemicals have been found to cause serious environmental______.
A.
dam
B.
damage
【单选题】To lable their product as organic ,famers have to obtain a certificate showing that no ______chemicals have been used to kill pests on the farm for two years.
A.
tragic
B.
toxic
C.
notorious
D.
nominal
【简答题】1 码 = 米。按照规则球座的长度不得超过4 英寸。高尔夫球场安排球员下场打球的时间很紧凑,每组大约相隔 分钟,所以每组客人必须遵循时间安排,便于后续组的出发安排。
【简答题】These chemicals have been found to cause serious environmental ________.
【多选题】对沉井下沉的施工要点的叙述中，正确的是( )。
A.
沉井下沉时，可使用爆破方法
B.
沉井下沉施工有排水除土和不排水除士两种方法
C.
沉井预制完成并准确就位后，开始抽除垫木
D.
井底下沉至设计标高2.0m以上时，应放慢下沉速度
E.
正常下沉时，应自刃脚处向中间均匀对称除土
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