How many species are there on Earth according to most scientists？
About 2 million.
B. About 10 million.
C. About 100 million.
D. About 1.75 million.
查看答案
The work human beings have created results from______.
A. humans' desire for food and clothing
B. humans' longing for friendship
C. inevitable evolution trend
D. development of civilization
赠与合同可以附负担，受赠人不履行负担的义务时，赠与人有权撤销赠与。()
A. 正确
B. 错误
在法律没有规定或当事人没有约定的条件下，买卖标的物意外毁损灭失的风险，标的物交付前由出卖人负担；标的物交付后，由买受人负担。()
A. 正确
B. 错误
What does "enterprise" in the last paragraph refer to？
A. The course of an action
B. A firm or a company
C. The exploration of something
D. A spirit of working hard
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