下列金属中，最活泼的是（ ） A．银 B．铜 C．镁 D．铝

下列图示是某同学在复习绿色植物的一生时，绘制和设计的实验探究图示，请据图回答：

（1）与菜豆种子结构比较，玉米种子在结构上的不同是                    。

（2）菜豆种子在萌发过程中所需的营养物质来自[   ]          ，发育成植株Ⅰ的结构是[   ]          。

（3）从组成菜豆幼苗的根的形态特征分析，菜豆的根系类型应属于        。使幼根不断长长的结构是菜豆根尖的         部位（用图中字母表示）。

（4）将菜豆幼苗放置在密闭的黑色塑料袋内（如图所示），经过一段时间后，挤压塑料袋，将冒出的气体通入澄清的石灰水中，观察到的现象是                  。这是因为                           。打开塑料袋，发现内壁附着许多水珠，这些水珠主要是经叶片的[  ]        散发出来的水蒸气形成的。

（5）下图是显微镜下观察根尖细胞时的视野，视野内结构1表示     ，结构2表示       。欲想更加仔细地观察结构2，应先将玻片向      移动，将结构2调至视野中央，再转动显微镜的[   ]　　　　　换用高倍镜，此时若发现物像不清楚则需调节显微镜的[    ]　　　　　　　　　，直至物像清晰为止。

下列加粗的成语使用不正确的一项是[ ]

A.在动物身上，无论从形态结构、生理过程，还是行为方面去分析，尽可能节省能量的例子几乎俯拾皆是。

B.单独游戏时，动物常常兴高采烈地独自奔跑、跳跃，在原地打圈子。

C.每当刮起大风时，成群的露脊鲸把尾鳍高高举出水面，正对着大风，以便像船帆似的，让大风推着它们，得意洋洋地“驶”向海岸。

D.研究者们各执己见 ，众说纷纭。

For many the only way to enjoy Ireland’s fantastic and breathtaking scenery is to take to the open road on a motoring holiday. It’s true to say that motoring can still be a pleasure on roads so empty of the traffic you are used to. You can choose your own route or let us suggest one or two. You can pre-book all your accommodation or just go as you please. You can choose your accommodation from good quality hotels in coast or country, village or city, guesthouses, town and country homes or farmhouses throughout the island. Naturally we will supply you with a good quality map to help you around.

Our Value Motoring holiday includes a wide selection of hotels and guesthouses. All hotels are fully licensed and certain guesthouses (as indicated) are also licensed. Bed and full Irish breakfast for 2 or 6 nights is indicated in your holiday price. Hotel and guesthouse gratings are shown by a figure in brackets (括号) after the name of each of the places. Facilities available are also shown after the grading. You may choose to travel on a Go As You Please or a pre-booked basis. On a Go As You Please holiday only the first night is booked for you in advance. For the rest of your holiday you book ahead as you travel (hotel reception will help) using the information lists we provide. A slight note of caution (警告) — in July and August it is advisable to book 2 or 3 days ahead. If you prefer to plan your holiday in advance then we will pre-book all accommodation for you. Just complete the booking form carefully using hotel codes indicated. If your first or second choice is not available we will book an alternative in the same place.

1 Why did the writer say a motoring holiday is the only way for many to enjoy the beauty of Ireland? Because____________.

A. travelers can go sightseeing at many places

B. its price is low and travelers feel comfortable

C. travelers can drive and choose the route freely

D. travelers have many good quality hotels to choose from

2. How many ways of accommodation does a motoring holiday supply?

A. Two            B. Four             C. Six              D. Eight

3. If the travelers choose to travel on a Go As You Please holiday, the travel agency will _____.

A. do nothing to help them                          B. only pre-book the first night for them

C. pre-book all the accommodation for them.           D. charge them less for the service

4. Supposing the travellers’ accommodation choices aren’t available in the tourism season, the travel agency will___________.

A. give up serving them                     B. choose one for them in another place

C. book an alternative in the same place        D. only book the first night for them

下述描述正确的是 。

A．在程序的一行中可以出现多个有效的预处理命令行

B．使用带参宏时，参数的类型应与宏定义时的一致

C．宏替换不占运行时间，只占编译时间

D．宏定义不能出现在函数的内部

现在三级跳远采用的是哪种跳法？（）

A.单足跳单足跳跳跃

B.单足跳跨步跳跳跃

C.单足跳双足跳跳跃

D.单足跳跨步跳跨步跳