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【简答题】
某湖泊由于大量排入污水，连续多次发生蓝藻爆发，引起水草死亡，周边居民也有出现某种有毒物质中毒现象的。请回答： (1)湖泊中导致蓝藻爆发的主要非生物因素是过量的____________。导致水草死亡的主要原因是水草生长的环境中缺少____________和____________这两种非生物因素。 (2)某小组分别于造成和下午在该湖泊的同一地点、同一水层取得两组水样，测得甲组pH为7.3，pH为6.0，那么取自早晨的水样是____________组，理由是_____________________________________，甲组水样中的Q 2 含量____________于的，理由是____________________________________。 (3)如果居民中毒是由于蓝藻中的某种有毒物质经事物链的传递引起的，这类食物链中含有的四个营养级的食物链是____________→____________→____________→人。
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【单选题】听力原文： In the local newspaper of my community recently there was a story about a man named Mike Smith. He lived in a small town about 40 miles from my home. He had served 5 years in a New York prison f...
A.
His criminal record.
B.
The high unemployment rate in New York.
C.
The long distance between his home town and New York.
D.
His unpopular character.
【多选题】不同品种的水泥凝结时间、早期强度、水化热和吸水性等性能各不相同，应按适用范围选用。其中，有耐磨要求的混凝土应优先选用（）
A.
普通硅酸盐水泥
B.
粉煤灰硅酸盐水泥
C.
矿渣硅酸盐水泥
D.
火山灰质硅酸盐水泥
E.
硅酸盐水泥
【单选题】This story is too difficult for us. _____ read something easier.
A.
Why not
B.
Why not to
C.
Why not you
D.
Why don’t
【单选题】听力原文： In the local newspaper of my community recently there was a story about a man named Virgle Spears. He lived in a small town about 40 miles from my home. He had served five years in a New York pr...
A.
The long distance between his home town and New York.
B.
His unpopular character.
C.
The high unemployment rate in New York.
D.
His criminal record.
【简答题】看图填空。 — Why _________ you give _________ at Christmas? — _________ an old, old story. Let's _________ the story _________ this book.
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