若θ∈$\frac{\mathrm{\pi }}{4}$，$\frac{\mathrm{\pi }}{2}$，tan2θ=﹣3$\sqrt{7}$，则sinθ=（　　）

    Many pet owners see their pets as family members. However，when they have to go away on business or for some other reasons，and cannot take their pets along，they feel guilty about it and wish they could do something for their deeply loved pets. The Pet Hotel is set up especially for this reason.

    What do we offer?

    The Pet Hotel offers pets large rooms and the latest equipment（设备）.Like other hotel rooms，we offer color TVs，suitable beds，sofas and other pieces of furniture for pets.

    We prepare great food for the little guests，walk them at least twice a day，and provide them with all kinds of amusements（娱乐活动）. In addition，we brush and clean pets. To make pets feel at home，we play the sort of music which is often played at their homes and turn the TV to the pets' favorite channels. Pets will surely feel comfortable in our hotel!

    We also have video cameras in each room so that owners can check online twenty-four hours a day to make sure that the pets are having a good time at the hotel. We also have phones so that pet owners can call their pets and talk to them every day.

    How much does it cost?

    The prices change according to the size of the rooms. A regular room with standard service costs 1,500 dollars.

“人认为，神也是生出来的，会说话，有形体，穿戴和人相同。如果牛、马或狮子也跟人一样，有手，能用手画画，能从事艺术活动，那么，牛会把神的模样画得像牛，马会把神的模样画的像马，每种动物都会把神的身体描绘得跟自己一样。埃塞俄比亚人说，他们的神是黑皮肤、扁鼻子；色雷斯人说，他们的神是蓝眼睛、红头发。”这反映了（  ）

他，著名地球物理学家、国家“千人计划”专家、给地球做CT的科学家，通过探测技术，能够快速扫描海面以下很深的水域，无论是矿藏还是潜艇队都逃不过他的法眼。7年前，当他离开旅居18年的英国回到中国，有外国媒体报道：“他的回国，让某国当年的航母演习整个舰队后退100海里”。他就是黄大年！