1、【题目】Insect pests are among the leading causes of crop failure.
选项：
A.expected
B.chief
C.natural
D.least
答案：
B
解析：
暂无解析
1、【题目】Blue－greenalgaegrowabundantlyinsaltmarshes.
选项：
A.primarily
B.slowly
C.onplants(cultivate)
D.ingreatnumbers
答案：
解析：
1、【题目】In 1861 it seemed inevitable that the Southern states would break away from the Union.
选项：
A.strange
B.certain
C.inconsistent
D.proper
答案：
B
解析：
暂无解析
1、【题目】Double Eagle in the first transatlantic balloon, was greeted by avid crowds in France.
选项：
A.eager
B.surging
C.appreciative
D.vigorous
答案：
A
解析：
暂无解析
1、【题目】TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
选项：
A.veryfriendly
B.veryuseful
C.verythoughtful.
D.verywealthy
答案：
解析：
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