10. all of you are top students, only one will be chosen for the coming competition.
A. While B. Since
C. If D. As
10. A考查狀語從句的連接詞。句意：盡管你們都是很優秀的學生，但是只有一個學生將被選出來參加競賽。while"盡管"，作這一用法時，常用于句首；since既然，因為；if是否；as 由于，隨著。句意前后有轉折關系，所以用while引導讓步狀語從句。故選A。
題目來源：2015全品語法快練高中英語新課標 > 訓練2狀語從句
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4. John seemed puzzled about the question meant.
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C
Gordon Sato was born in Los Angeles in the 1920s. He learned to make corn grow in the dry and dusty soil. He later became a cell biologist. He earned many honours for his research.
In 1985， he went to Eritrea. There he noticed that camels were eating the leaves of mangrove trees(紅樹)growing along the coast. He planted more mangroves so they could be used to feed livestock. But at first all the new trees died. Then Gordon Sato observed that mangrove trees only grew naturally where there was fresh water some of the time. The fresh water provided minerals(礦物質)that salt water lacked. Gordon Sato found a way to provide these minerals by putting the minerals into small plastic bags at the base of each tree. Each plastic bag had a tiny hole that was very careful?ly sized.
The women in the village of Hargigo started to feed the leaves of the mangrove trees to their sheep and goats. But the animals were not produ?cing enough milk for their babies. Gordon Sato asked the villagers to grind (磨碎)the remains of fish they had eaten and spread this fish paste on the leaves. This provided protein for the sheep and goats so they could produce more milk.
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A.Because nobody helped wato therii. I
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D Because they were too close to each other.
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